<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font: 13px Helvetica, Arial; }
        iframe { width: '50%'; height: '50%'; }
    </style>
</head>
<body>
    <div style="position: absolute; width: 100%; height: 100%;">
        <iframe src="inGame.html?userName=player1" width="48%" height="48%"></iframe>
        <iframe src="inGame.html?userName=player2" width="48%" height="48%"></iframe>
        <iframe src="inGame.html?userName=player3" width="48%" height="48%"></iframe>
        <iframe src="inGame.html?userName=player4" width="48%" height="48%"></iframe>
    </div>
</body>
</html>